Traditional gasoline car fault
Search fault code and browse forum case posts.
This page is designed for quick diagnosis on gasoline vehicles by combining code lookup with real discussion cases. Enter a fault code to filter related topics, then compare symptom context such as cold start behavior, acceleration load, fuel-trim deviation, ignition misfire pattern, and recent maintenance history. Many codes can be triggered by shared root causes, so use cross-checks from multiple posts before replacing sensors, coils, injectors, or catalytic components.
P0304 and P0440 Fault Codes - 2003 Dodge Neon Diagnosis and Repair Costs
My 2003 Dodge Neon has persistent fault codes P0304 (Misfire Detected - Cylinder 4) and P0441 (Incorrect Evaporative Emission System Purge Flow). I've already replaced the spark...
2003 Dodge Neon | P03041999 Ford Explorer Code P1747: Causes and Symptoms When Engine Stalls in Gear
I'm experiencing a diagnostic code P1747 on my 1999 Ford Explorer. The engine starts fine, but when I shift into gear and press the accelerator, it stalls. What could be causing...
1999 Ford Explorer | P17471999 Mercury Cougar P1131 O2 Sensor Code: Causes and Fixes
Hi everyone, I'm looking for help with a persistent check engine light on my 1999 Mercury Cougar. The diagnostic scan shows code P1131 — 'O2 Sensor 1 (Bank 1) Indicates Lean Con...
99 Mercury Cougar | P11311999 GMC Suburban LT 1500 P0305 Fault Code: Causes, Solutions, and What to Do Before Inspection
The P0305 diagnostic trouble code has appeared on my 1999 GMC Suburban LT 1500. Although the code was cleared using an OBD2 scanner, I'm concerned about whether it's a recurring...
1999 Suburban LT 1500 | P03052002 Chevrolet Trailblazer EXT experiencing PO300 and intermittent P0301 codes - troubleshooting guide
I own a 2002 Chevrolet Trailblazer EXT with just over 60,000 miles on the odometer. Recently, I've started receiving both intermittent P0301 and a persistent PO300 diagnostic tr...
2002 Trailblazer | P0301P0308 Fault Diagnosis for 2000 Lincoln Navigator: Common Causes and Fixes
Hello, I recently noticed my 2000 Lincoln Navigator starting to run roughly, with the engine light illuminating. After checking at AutoZone, I was given a P0308 diagnostic code....
2000 Lincoln Navigator | P03081996 BMW 740iL - P1174 and P11-75 Fault Codes: CE Light Returning After O2 Sensor Replacement
Hello, I've been experiencing a persistent Check Engine (CE) light on my 1996 BMW 740iL, which is now preventing me from passing emissions testing and registering the vehicle. ...
1996 BMW 740iL | P1174P0761 Fault Code in 1997 Ford Taurus GL: Fix Overdrive Issue at Home or Hire Professional?
I own a 1997 Ford Taurus GL with a 3.0-liter 6-cylinder engine. The check engine light is currently on, and the diagnostic code displayed is P0761: Shift Solenoid C Performance ...
1997 Ford Taurus GL | P0761P0171 Fuel Trim Issue in Dodge Truck After Intake Manifold Gasket Replacement
The issue continues with my Dodge truck. After replacing the intake manifold gasket (a painful job!), I drove it around town this weekend without any problems. However, during a...
Dodge truck | P01712000 VW Jetta 4Cyl GLS - P1255, P0134, P0302: Rough Idle, Cold Start Vibration & Misfire Diagnosis
2000 Volkswagen Jetta 4-cylinder GLS, 113,000 miles. I've noticed a severe rough idle when starting my car, especially during cold starts. The vibration disappears after I acce...
2000 VW Jetta | P0134P1105 DTC Diagnosis and Fix for 2000 Nissan Frontier
Hi everyone, I'm currently dealing with a P1105 DTC on my 2000 Nissan Frontier. The dealership claims there is no map/baro pressure switch valve, but the vehicle's onboard diagn...
2000 Nissan Frontier | P1105P0140 O2 Sensor Error on 2000 Pontiac Grand Prix 3.1L - Repeated Code After Replacement
I have a 2000 Pontiac Grand Prix with a 3.1L engine that's consistently throwing out the P0140 diagnostic code. I initially replaced the oxygen sensor located before the catalyt...
Grand Prix | P0140BMW 98 528i OBD2 Fault Codes P1423, P1421, and P0420 Explained - What They Mean and How to Fix
I recently encountered OBD2 fault codes P1423, P1421, and P0420 on my 1998 BMW 528i with a manual transmission. The vehicle has 153,000 miles and all maintenance was performed b...
BMW | P0420PO430 Fault Code on 1997 Chevrolet 5.7L - Passenger Side Catalyst System Issue
After replacing both front and rear oxygen sensors (passenger side) on my 1997 Chevrolet with a 5.7L V8 engine, I continue to receive the PO430 diagnostic code after the vehicle...
97 Chevy | P0430PO780 Transmission Shift Malfunction in 1996 Geo Metro LSI Automatic - Diagnoses and Affordable Fixes
I own a 1996 Geo Metro LSI with a 1.3L engine and an automatic transmission. While this car is not considered reliable, I'm a college student with limited budget, so I'm trying ...
Geo Metro Lsi | P07802002 Chevrolet Malibu 3.1L Engine P1361 Fault: What Component Needs Replacement?
Hi everyone, I own a 2002 Chevrolet Malibu with a 3.1L engine, and I've recently picked up the diagnostic code P1361. The OBD-II manual indicates this code stands for 'Ignition...
Malibu | P13612000 Plymouth Neon Check Engine Light: Codes 1654 and 0171 Explained
I recently purchased a 2000 Plymouth Neon with 103,800 miles and am experiencing a check engine light. The vehicle displays two diagnostic trouble codes: 1654 and 0171. Code 16...
2000 Neon | P01711997 Ford Taurus 3.0L Misfire and Stumble at Idle/Load - P0420 Catalyst Efficiency Code
My 1997 Ford Taurus 3.0L engine exhibits misfires and stumbles specifically at idle and under load (around 1-2,000 RPM). Highway driving above 2,000 RPM is smooth with no issues...
97 Taurus 3.0 | P0420Practical workflow for fault-code troubleshooting
Start by confirming battery voltage and reading freeze-frame data, then inspect wiring and connectors before replacing parts. If the code returns after clearing, record the exact driving or idling condition when it reappears. Prefer case threads with complete repair feedback, because confirmed outcomes provide stronger guidance than one-time symptom descriptions. Following a step-by-step workflow reduces repeated repairs and lowers total diagnosis time.